Distributed RFID Readers Using Single Antennas for Omnidirectional Coverage
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing passive RFID readers require multiple antennas and RF ports to achieve 360-degree coverage, increasing costs and installation time due to the need for significant isolation between transmit and receive antennas, which limits their range and efficiency.
Innovation Solution
Implementing a system with multiple RFID readers, each using a single antenna for both transmit and receive functions, allowing for omnidirectional communication and reducing the need for multiple antennas and RF ports by using a common control point to select the best reader for transmission and data processing based on signal characteristics.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If multiple antennas and RF ports are used to achieve 360-degree coverage, then the coverage area is improved, but the device complexity and cost increase
Solution Approach 1:
The system divides the coverage area into multiple sectors, with each reader responsible for a specific sector. This segmentation allows the overall coverage to be achieved through multiple simple readers rather than one complex reader with multiple antennas, thereby reducing device complexity while maintaining comprehensive coverage.
Solution Approach 2:
The patent transitions from a single reader with multiple antennas (horizontal dimension) to multiple readers distributed in space (spatial dimension). By adding the spatial distribution dimension, the system achieves 360-degree coverage through geometric arrangement rather than through multiple antennas on a single device, reducing overall system complexity.
2Reliability
If multiple antennas are used with significant isolation, then the transmit and receive functions are improved, but the installation time and cost increase
Solution Approach 1:
The system segments the transmit and receive functions across different readers rather than requiring multiple antennas on a single reader. Each reader can use a single antenna for both functions, eliminating the need for complex isolation requirements and reducing installation time while maintaining reliable transmit and receive operations.
Solution Approach 2:
The patent introduces a coordinator as an intermediary that manages communication between multiple readers and RFID tags. This coordinator handles the complexity of managing multiple readers, allowing each reader to remain simple with single-antenna designs, thereby reducing installation time while maintaining system reliability through centralized control.
3Reliability
If directional antennas are used to reduce coupling, then the isolation between antennas is improved, but the coverage area decreases
Solution Approach 1:
The system segments the coverage area into multiple directional sectors, with each reader covering a specific sector. While each reader uses directional antennas with limited coverage, the collective coverage of multiple readers spans the entire area, maintaining both isolation between antennas and comprehensive coverage.
Solution Approach 2:
The patent compensates for the limited coverage of directional antennas by adding spatial distribution of multiple readers. Instead of relying on a single reader with omnidirectional coverage, the system uses multiple readers positioned at different locations, each with directional antennas, to collectively achieve full coverage while maintaining antenna isolation.
4Area of stationary object
If multiple pairs of antennas are used per reader, then the coverage angle is improved, but the quantity of components and cost increase
Solution Approach 1:
The system segments the functionality of multiple antenna pairs into separate readers. Instead of each reader having multiple antenna pairs, the coverage function is distributed across multiple readers, each with simpler antenna configurations. This reduces the quantity of components per reader while maintaining overall coverage through spatial distribution.
Solution Approach 2:
The patent merges the coverage functions of multiple antenna pairs into a distributed network of readers. The collective coverage capability of multiple readers with single or fewer antennas equals or exceeds that of a single reader with multiple antenna pairs, while reducing the total component count and cost through shared infrastructure and simplified individual reader designs.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach reduces costs and installation time while enabling effective communication with battery-assisted passive RFID devices over a range of at least 20 meters with minimal isolation between antennas, enhancing the efficiency and coverage of RFID systems.
Implementation Method 1
As an RFID tag operates in the radio frequency (RF) portion of the electromagnetic spectrum, wireless communication can occur between an RFID tag and an RFID tag reader
Implementation Method 2
the reader transmitting emits a signal sufficient to communicate with a battery assisted passive RFID device at a range of at least 20 meters
Data Source
AI summary
A system in one embodiment includes a plurality of Radio Frequency Identification (RFID) readers, each reader being capable of using a single antenna for both transmit and receive functions, wherein, during operation, one of the readers transmits and at least another of the readers receives a response to the transmission from an RFID device. A system in another embodiment includes a plurality of Radio Frequency Identification (RFID) readers, each reader having at least one antenna mounted on a housing thereof, wherein, during operation, the reader transmitting emits a signal sufficient to communicate with a battery assisted passive RFID device at a range of at least 20 meters. Additional systems and methods are also presented.